I think you are being willfully blind and are pretty far out there even for the community of 911 conspiracy theorists. Try reading the official 911 report for starters. It has tons of evidence of hijackers getting on planes, including videos of hijackers passing through security,and recordings of flight personnel saying hijackers have taken control of planes. The tortured testimony of KSM might be partially discounted, but it’s hard to deny Osama Bin Laden claiming credit for 911. I could add dozens of specific facts and pieces of evidence you choose to deny. It all says Islamic terrorists in fact hijacked those planes.
I’ll just add one final set of facts. Have you ever been to the Flight 93 memorial in Pennsylvania? Have you listened to the dozens of recordings of cell calls from passengers saying hijackers had taken over the plane and that they were about to try to take it back?
Really when you make a theory you can’t throw out all the evidence that exists and then say there’s no evidence. Start with the magic bullet and show the official story of the bullet is highly implausible — don’t throw away the bullet and say no evidence exists for a bullet.